Cornice-press



UNITED STATES PATENT OEEICE.

FRANK M. LEAVITT, OF BROOKLYN, NEINT YORK, ASSIGN OR TO THE VULOAN l COMPANY, OF PHILADELPHIA, PENNSYLVANIA.

CORNICE-PRESS.

SPECIFICATION forming part of Letters Patent No, 476,946, dated June 14, 1892. Application filed February 26, 1892. Serial No. 422,939. (No model.)

To LZZ whom t may concern into a suitable hole or notch in the force, so Be it known that I, FRANK M. LEAVITT, a as to lock Jthe saine in place. The weight of citizen of the United States, residing at Brookthe force is thus sustained by thelatches and lyn, Kings county, New York, have invented for some purposes the groove h olds it with 55 5 certain new and useful Improvements in sufficient accuracy in the desired relation to Holding Dies in Cornice -Presses, fully dethe lower die; but set-screws are also provided scribed and represented in the following specito clamp the force rigidly in doing fine work. eation and theaccompanyingdrawings,torm p In the annexed drawings, Figure l repreiug a part of the same. sents the cross-head and bed-piece of a cor- 6o xo The object of this invention is to secure nice-press with the tools attached thereto. and adjust the dies in cornice-presses in such Fig. 2 is a view of portion of the cross-head manner as to clamp the same with the utmost and lower-die holder adjacent to the latch, and facility and to also, when required, secure Fig. 3 is a cross-section of the parts shown in them with the utmost accuracy. The dies in Fig. 2 ou line .fr in Fig. l. 65 I5 such presses are often made of slender crossy In Fig. l, A is the bed-piece of a powersection and great length, as eight or ten feet, press adapted to bend sheet metal eight or for creasing and bending long pieces of sheet ten feet in length. B is the reciprocating metal, and where an acute bend is required cross-l1ead,shown provided with lugs C, havupon an exact line in such metal it is obing pins O for the attachment of connectiug- 7o ze viously necessary to hold the dies rmly and rods.

apply them accurately to such line upon the In apower-press the bed-piece is commonly metal. held stationary and the cross-head suitably Heretofore it has been common to set the guided in its reciprocations to and from the lowerdieinanopen grooveinasuitablestandsame; but the parts required to guide and 75 25 ard upon the bed of the cornice-press and to actuate the cross-head are not shown herein, secure the upper die or force in a similar as the construction and operation of powergroove in the movable'eross-head of the press presses is already well known in the art. by means of pins inserted across the groove The lower-die holder D is shown in Figs.. 2 through the force and cross-head. Set-screws and 3 provided with groove d', adapted to re- 8o 3o have also been used to clamp'the die or force ceive the lower die e, and the holder is shown in the groove; but either a pin or set-screw provided with bolts a, fitted to transverse is inconvenient where forces of great length slots a2 in the bed-piece A. are used, as it is very difeult for asingle op The cross-head in Figs. 2 and 3 is shown erator to sustain the entire weight andlength provided with a groove f, adapted to receive 85 35 of the force and at the same time secure it the force g, and a hole h is shown provided in the groove. in the force to receive the jaw t' of a latch- My present invention furnishes a means of lever j, pivoted upon the cross-head. Such automatically locking the force to the crosslever is shown pivoted at its middle and pro head by the .mere insertion of the force in vided at its upper end Withaspring n, adapted 9o 4o the groove, spring-latches being provided to to throw the jaw 71 into one side of the groove f.

engage the force near its ends when pressed For con venienee ot' manufacture the latch- :into such groove. lever is pivoted by a pin m upon a bracket Z, Theinvention also furnishes means for holdwhich is attached to the cross-head by bolts ing the die and force accurately in their re- Z, and the jaw operates through a notch o, 95 45 spective grooves when tine adjustment is reformed transversely to the groove f in one side quired, as to render the spring-latches autoof the cross-head. The jaw is projected by matic their jaws are held within the surface the spring normally within one side of the of the groove and are provided with a slopgroove f, and its lower face is sloped outing face, so as to yield or be pushed readily wardly, so as to be readily pushed outward roo 5o outward when the force is pressed to the botwhen the force is pressed upward into the tom of the groove, the jaw then springing groove. Such lever, with its spring, constitutes an automatic latch adapted to engagev with the hole hin the force as soon as the latter is pressed to the bottom of the groove, as the hole is formed to admit the jaw when the force is pressed to the bottom of the groove. Vith this construction it is obvious that the operator may balance a long and heavy force by supporting it at the middle and that as soon as it is pressed upward into the groove of the cross-head it will be engaged by the jaw l,

t' and its weight entirely supported. The jaws may be readily retracted from the holes h to detach the force from the cross-head by pressing upon the opposite end of the lever j, which draws the jaw t' from the side of the groovef, and thus releases the force.

Where an accurate adjustment of the force and die are not required, they maybe merely inserted in their respective grooves; but to: hold them rigidly, when desired, I provide.-`

notchesp in one side of the cross-head and die-holder, extending to one side of the groove,

to apply the pressure of a bolt r upon the die or force, and thus clamp the same rigidly to the opposite side of the groove. Such bolt is shown in the die-holder in Figs. 2 and 3 and upon the cross-head in Fig. l, with the nut qapplied accurately in a given line upon the sheet metal by clamping the tools firmly in.-

the die-holder and cross-head, and the notches p furnish the means of fitting bolts entirely through the force and die or also pressing upon one side of the same to hold it rigidly long force g and with notches 0, formed in the grove.

My invention furnishes in the latches a` means of holding the dies conveniently for work that does not require accuracy, while` the addition of the bolts r to the cross-head and die-holder furnishes a means of clamp-` ing the tools rigidly when required.

Two of the latches are shown upon the cross-head in Fig. l; but it is obvious that one alone may be applied to the middle of the force or that a greater number may be used, f

if desired. It is also obvious that the latches would have no function if applied to the die-` holder D, a's the holder supports the die by gravity as soon as it is applied to the groove,

exactly with the lower die.

The die isf` Sucht tools when used for fine work can only be.

sloping faces nor adapted to engage the die automatically when inserted in the machine, as they are not intended to supportl merely the weight of the parts, but are actuated positively by cams and fixtures so as to release the die during a portion of each stroke. I hereby disclaim such a construction, as my latches are intended solely to support the weight of the force, which is held permanently in the groove during its use in the machine and which is clamped therein by independent means when required to align By pivoting the jaw upon an independent bracket l it is adapted to fasten readily upon the cross-head A by means of the screws or bolts l. The automatic latches are thus adapted for application to many power-presses already in use, to which they would be vfitted by cutting the notches 0 into the cross-head, as described herein, and bolting the latch-fixtures in place by means of bolts Z', with the jaw projected through the notch into the groove.

Havingthus set forth the nature of my invention, what I claim is 1. In acornice-press, the combination, with a reciprocating cross-head provided upon its under side with the groovef to admit a longl force g, of one or more latches j, pivoted at the side of the groove at right angles to the force and having a jaw t' pressed normally Ainto one side of the groove to engage the force, the lower face of the jaw being sloped, and thereby adapted to press outward automatically when the force is placed in the groove, substantially as set forth.

2. In acornice-press, the combination, with the reciprocating cross-head B, provided upon its under side with the groove f to admit a transversely to the groove at one side of the same, of the latches j, pivoted adjacent to the notches and having each a jaw i projected through the notch 0 into the groove, with the lower face of the jaw sloped outwardly, as and for the purpose Set forth.

3. In a'cornice-press, the combination, with the reciprocating cross-head B, provided upon its under side with the groove f and having the notches o formed transversely to such groove, of the brackets Z, bolted to the cross-head adjacent to the notches o, and the latches j, pivoted each in the bracket by pin m and having the jaw t', with its underside sloped outwardly and pressed normally into the groove f yby a spring, as and for. the purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

FRANK M. LEAVITF.

Vitnesses:

HOWARD C. SEAMAN, JAMES A. GRAY.

Sgs

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